One thing I just learned about xkcd — if you mouse over the strip, you get another joke. Some are almost as funny as the main strip. So even if you have already seen the database-classic xkcd linked above, you might want to revisit it.

In a very different vein is Dadhacker’s list of real or imaginary past shenanigans, (Edit: The original link is fried, but here’s a partial replacement) which starts:

I am not permitted to replace a coworker’s reference books (including his Knuth, Sedgewick, and C++ reference manuals) with several linear feet of steamy hardback romance novels.

I will not name my variables after nasty tropical diseases, or executives who are under indictment for fraud.

Elevators are not toys, nor should they ever be wired into the corporate net.

Funny and vaguely prankish (and not for the language-squeamish) is this non-xkcd comic about NoSQL. And finally (definitely also for the non-squeamish), see the first long comment in this Reddit thread, which seems to have successfully pranked a whole lot of readers.